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1174 lines
28 KiB
1174 lines
28 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2010 Christoph Mair <[email protected]> |
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* Copyright (c) 2012 Bosch Sensortec GmbH |
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* Copyright (c) 2012 Unixphere AB |
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* Copyright (c) 2014 Intel Corporation |
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* Copyright (c) 2016 Linus Walleij <[email protected]> |
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* |
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* Driver for Bosch Sensortec BMP180 and BMP280 digital pressure sensor. |
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* |
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* Datasheet: |
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* https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BMP180-DS000-121.pdf |
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* https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BMP280-DS001-12.pdf |
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* https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BME280_DS001-11.pdf |
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*/ |
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#define pr_fmt(fmt) "bmp280: " fmt |
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#include <linux/device.h> |
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#include <linux/module.h> |
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#include <linux/regmap.h> |
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#include <linux/delay.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/interrupt.h> |
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#include <linux/irq.h> /* For irq_get_irq_data() */ |
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#include <linux/completion.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/random.h> |
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#include "bmp280.h" |
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|
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/* |
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* These enums are used for indexing into the array of calibration |
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* coefficients for BMP180. |
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*/ |
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enum { AC1, AC2, AC3, AC4, AC5, AC6, B1, B2, MB, MC, MD }; |
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|
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struct bmp180_calib { |
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s16 AC1; |
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s16 AC2; |
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s16 AC3; |
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u16 AC4; |
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u16 AC5; |
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u16 AC6; |
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s16 B1; |
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s16 B2; |
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s16 MB; |
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s16 MC; |
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s16 MD; |
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}; |
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|
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/* See datasheet Section 4.2.2. */ |
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struct bmp280_calib { |
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u16 T1; |
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s16 T2; |
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s16 T3; |
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u16 P1; |
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s16 P2; |
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s16 P3; |
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s16 P4; |
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s16 P5; |
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s16 P6; |
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s16 P7; |
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s16 P8; |
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s16 P9; |
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u8 H1; |
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s16 H2; |
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u8 H3; |
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s16 H4; |
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s16 H5; |
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s8 H6; |
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}; |
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static const char *const bmp280_supply_names[] = { |
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"vddd", "vdda" |
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}; |
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#define BMP280_NUM_SUPPLIES ARRAY_SIZE(bmp280_supply_names) |
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struct bmp280_data { |
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struct device *dev; |
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struct mutex lock; |
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struct regmap *regmap; |
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struct completion done; |
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bool use_eoc; |
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const struct bmp280_chip_info *chip_info; |
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union { |
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struct bmp180_calib bmp180; |
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struct bmp280_calib bmp280; |
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} calib; |
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struct regulator_bulk_data supplies[BMP280_NUM_SUPPLIES]; |
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unsigned int start_up_time; /* in microseconds */ |
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|
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/* log of base 2 of oversampling rate */ |
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u8 oversampling_press; |
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u8 oversampling_temp; |
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u8 oversampling_humid; |
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|
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/* |
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* Carryover value from temperature conversion, used in pressure |
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* calculation. |
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*/ |
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s32 t_fine; |
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}; |
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struct bmp280_chip_info { |
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const int *oversampling_temp_avail; |
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int num_oversampling_temp_avail; |
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const int *oversampling_press_avail; |
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int num_oversampling_press_avail; |
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const int *oversampling_humid_avail; |
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int num_oversampling_humid_avail; |
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int (*chip_config)(struct bmp280_data *); |
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int (*read_temp)(struct bmp280_data *, int *); |
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int (*read_press)(struct bmp280_data *, int *, int *); |
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int (*read_humid)(struct bmp280_data *, int *, int *); |
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}; |
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/* |
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* These enums are used for indexing into the array of compensation |
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* parameters for BMP280. |
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*/ |
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enum { T1, T2, T3 }; |
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enum { P1, P2, P3, P4, P5, P6, P7, P8, P9 }; |
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|
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static const struct iio_chan_spec bmp280_channels[] = { |
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{ |
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.type = IIO_PRESSURE, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | |
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), |
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}, |
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{ |
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.type = IIO_TEMP, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | |
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), |
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}, |
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{ |
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.type = IIO_HUMIDITYRELATIVE, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | |
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), |
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}, |
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}; |
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static int bmp280_read_calib(struct bmp280_data *data, |
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struct bmp280_calib *calib, |
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unsigned int chip) |
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{ |
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int ret; |
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unsigned int tmp; |
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__le16 l16; |
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__be16 b16; |
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struct device *dev = data->dev; |
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__le16 t_buf[BMP280_COMP_TEMP_REG_COUNT / 2]; |
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__le16 p_buf[BMP280_COMP_PRESS_REG_COUNT / 2]; |
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|
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/* Read temperature calibration values. */ |
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ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_TEMP_START, |
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t_buf, BMP280_COMP_TEMP_REG_COUNT); |
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if (ret < 0) { |
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dev_err(data->dev, |
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"failed to read temperature calibration parameters\n"); |
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return ret; |
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} |
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/* Toss the temperature calibration data into the entropy pool */ |
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add_device_randomness(t_buf, sizeof(t_buf)); |
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calib->T1 = le16_to_cpu(t_buf[T1]); |
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calib->T2 = le16_to_cpu(t_buf[T2]); |
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calib->T3 = le16_to_cpu(t_buf[T3]); |
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/* Read pressure calibration values. */ |
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ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_PRESS_START, |
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p_buf, BMP280_COMP_PRESS_REG_COUNT); |
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if (ret < 0) { |
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dev_err(data->dev, |
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"failed to read pressure calibration parameters\n"); |
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return ret; |
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} |
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/* Toss the pressure calibration data into the entropy pool */ |
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add_device_randomness(p_buf, sizeof(p_buf)); |
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calib->P1 = le16_to_cpu(p_buf[P1]); |
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calib->P2 = le16_to_cpu(p_buf[P2]); |
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calib->P3 = le16_to_cpu(p_buf[P3]); |
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calib->P4 = le16_to_cpu(p_buf[P4]); |
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calib->P5 = le16_to_cpu(p_buf[P5]); |
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calib->P6 = le16_to_cpu(p_buf[P6]); |
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calib->P7 = le16_to_cpu(p_buf[P7]); |
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calib->P8 = le16_to_cpu(p_buf[P8]); |
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calib->P9 = le16_to_cpu(p_buf[P9]); |
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|
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/* |
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* Read humidity calibration values. |
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* Due to some odd register addressing we cannot just |
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* do a big bulk read. Instead, we have to read each Hx |
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* value separately and sometimes do some bit shifting... |
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* Humidity data is only available on BME280. |
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*/ |
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if (chip != BME280_CHIP_ID) |
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return 0; |
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ret = regmap_read(data->regmap, BMP280_REG_COMP_H1, &tmp); |
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if (ret < 0) { |
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dev_err(dev, "failed to read H1 comp value\n"); |
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return ret; |
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} |
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calib->H1 = tmp; |
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ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_H2, &l16, 2); |
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if (ret < 0) { |
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dev_err(dev, "failed to read H2 comp value\n"); |
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return ret; |
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} |
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calib->H2 = sign_extend32(le16_to_cpu(l16), 15); |
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ret = regmap_read(data->regmap, BMP280_REG_COMP_H3, &tmp); |
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if (ret < 0) { |
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dev_err(dev, "failed to read H3 comp value\n"); |
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return ret; |
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} |
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calib->H3 = tmp; |
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ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_H4, &b16, 2); |
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if (ret < 0) { |
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dev_err(dev, "failed to read H4 comp value\n"); |
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return ret; |
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} |
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calib->H4 = sign_extend32(((be16_to_cpu(b16) >> 4) & 0xff0) | |
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(be16_to_cpu(b16) & 0xf), 11); |
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ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_H5, &l16, 2); |
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if (ret < 0) { |
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dev_err(dev, "failed to read H5 comp value\n"); |
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return ret; |
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} |
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calib->H5 = sign_extend32(((le16_to_cpu(l16) >> 4) & 0xfff), 11); |
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ret = regmap_read(data->regmap, BMP280_REG_COMP_H6, &tmp); |
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if (ret < 0) { |
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dev_err(dev, "failed to read H6 comp value\n"); |
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return ret; |
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} |
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calib->H6 = sign_extend32(tmp, 7); |
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return 0; |
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} |
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/* |
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* Returns humidity in percent, resolution is 0.01 percent. Output value of |
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* "47445" represents 47445/1024 = 46.333 %RH. |
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* |
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* Taken from BME280 datasheet, Section 4.2.3, "Compensation formula". |
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*/ |
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static u32 bmp280_compensate_humidity(struct bmp280_data *data, |
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s32 adc_humidity) |
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{ |
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s32 var; |
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struct bmp280_calib *calib = &data->calib.bmp280; |
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var = ((s32)data->t_fine) - (s32)76800; |
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var = ((((adc_humidity << 14) - (calib->H4 << 20) - (calib->H5 * var)) |
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+ (s32)16384) >> 15) * (((((((var * calib->H6) >> 10) |
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* (((var * (s32)calib->H3) >> 11) + (s32)32768)) >> 10) |
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+ (s32)2097152) * calib->H2 + 8192) >> 14); |
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var -= ((((var >> 15) * (var >> 15)) >> 7) * (s32)calib->H1) >> 4; |
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var = clamp_val(var, 0, 419430400); |
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return var >> 12; |
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}; |
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/* |
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* Returns temperature in DegC, resolution is 0.01 DegC. Output value of |
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* "5123" equals 51.23 DegC. t_fine carries fine temperature as global |
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* value. |
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* |
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* Taken from datasheet, Section 3.11.3, "Compensation formula". |
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*/ |
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static s32 bmp280_compensate_temp(struct bmp280_data *data, |
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s32 adc_temp) |
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{ |
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s32 var1, var2; |
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struct bmp280_calib *calib = &data->calib.bmp280; |
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var1 = (((adc_temp >> 3) - ((s32)calib->T1 << 1)) * |
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((s32)calib->T2)) >> 11; |
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var2 = (((((adc_temp >> 4) - ((s32)calib->T1)) * |
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((adc_temp >> 4) - ((s32)calib->T1))) >> 12) * |
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((s32)calib->T3)) >> 14; |
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data->t_fine = var1 + var2; |
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return (data->t_fine * 5 + 128) >> 8; |
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} |
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/* |
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* Returns pressure in Pa as unsigned 32 bit integer in Q24.8 format (24 |
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* integer bits and 8 fractional bits). Output value of "24674867" |
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* represents 24674867/256 = 96386.2 Pa = 963.862 hPa |
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* |
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* Taken from datasheet, Section 3.11.3, "Compensation formula". |
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*/ |
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static u32 bmp280_compensate_press(struct bmp280_data *data, |
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s32 adc_press) |
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{ |
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s64 var1, var2, p; |
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struct bmp280_calib *calib = &data->calib.bmp280; |
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var1 = ((s64)data->t_fine) - 128000; |
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var2 = var1 * var1 * (s64)calib->P6; |
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var2 += (var1 * (s64)calib->P5) << 17; |
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var2 += ((s64)calib->P4) << 35; |
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var1 = ((var1 * var1 * (s64)calib->P3) >> 8) + |
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((var1 * (s64)calib->P2) << 12); |
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var1 = ((((s64)1) << 47) + var1) * ((s64)calib->P1) >> 33; |
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if (var1 == 0) |
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return 0; |
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p = ((((s64)1048576 - adc_press) << 31) - var2) * 3125; |
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p = div64_s64(p, var1); |
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var1 = (((s64)calib->P9) * (p >> 13) * (p >> 13)) >> 25; |
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var2 = ((s64)(calib->P8) * p) >> 19; |
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p = ((p + var1 + var2) >> 8) + (((s64)calib->P7) << 4); |
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return (u32)p; |
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} |
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static int bmp280_read_temp(struct bmp280_data *data, |
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int *val) |
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{ |
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int ret; |
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__be32 tmp = 0; |
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s32 adc_temp, comp_temp; |
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ret = regmap_bulk_read(data->regmap, BMP280_REG_TEMP_MSB, &tmp, 3); |
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if (ret < 0) { |
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dev_err(data->dev, "failed to read temperature\n"); |
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return ret; |
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} |
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adc_temp = be32_to_cpu(tmp) >> 12; |
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if (adc_temp == BMP280_TEMP_SKIPPED) { |
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/* reading was skipped */ |
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dev_err(data->dev, "reading temperature skipped\n"); |
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return -EIO; |
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} |
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comp_temp = bmp280_compensate_temp(data, adc_temp); |
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/* |
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* val might be NULL if we're called by the read_press routine, |
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* who only cares about the carry over t_fine value. |
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*/ |
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if (val) { |
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*val = comp_temp * 10; |
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return IIO_VAL_INT; |
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} |
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return 0; |
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} |
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static int bmp280_read_press(struct bmp280_data *data, |
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int *val, int *val2) |
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{ |
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int ret; |
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__be32 tmp = 0; |
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s32 adc_press; |
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u32 comp_press; |
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/* Read and compensate temperature so we get a reading of t_fine. */ |
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ret = bmp280_read_temp(data, NULL); |
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if (ret < 0) |
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return ret; |
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ret = regmap_bulk_read(data->regmap, BMP280_REG_PRESS_MSB, &tmp, 3); |
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if (ret < 0) { |
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dev_err(data->dev, "failed to read pressure\n"); |
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return ret; |
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} |
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adc_press = be32_to_cpu(tmp) >> 12; |
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if (adc_press == BMP280_PRESS_SKIPPED) { |
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/* reading was skipped */ |
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dev_err(data->dev, "reading pressure skipped\n"); |
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return -EIO; |
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} |
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comp_press = bmp280_compensate_press(data, adc_press); |
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*val = comp_press; |
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*val2 = 256000; |
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return IIO_VAL_FRACTIONAL; |
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} |
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static int bmp280_read_humid(struct bmp280_data *data, int *val, int *val2) |
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{ |
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__be16 tmp; |
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int ret; |
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s32 adc_humidity; |
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u32 comp_humidity; |
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/* Read and compensate temperature so we get a reading of t_fine. */ |
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ret = bmp280_read_temp(data, NULL); |
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if (ret < 0) |
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return ret; |
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ret = regmap_bulk_read(data->regmap, BMP280_REG_HUMIDITY_MSB, &tmp, 2); |
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if (ret < 0) { |
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dev_err(data->dev, "failed to read humidity\n"); |
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return ret; |
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} |
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adc_humidity = be16_to_cpu(tmp); |
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if (adc_humidity == BMP280_HUMIDITY_SKIPPED) { |
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/* reading was skipped */ |
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dev_err(data->dev, "reading humidity skipped\n"); |
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return -EIO; |
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} |
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comp_humidity = bmp280_compensate_humidity(data, adc_humidity); |
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*val = comp_humidity * 1000 / 1024; |
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|
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return IIO_VAL_INT; |
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} |
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static int bmp280_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
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int *val, int *val2, long mask) |
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{ |
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int ret; |
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struct bmp280_data *data = iio_priv(indio_dev); |
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|
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pm_runtime_get_sync(data->dev); |
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mutex_lock(&data->lock); |
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|
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switch (mask) { |
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case IIO_CHAN_INFO_PROCESSED: |
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switch (chan->type) { |
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case IIO_HUMIDITYRELATIVE: |
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ret = data->chip_info->read_humid(data, val, val2); |
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break; |
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case IIO_PRESSURE: |
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ret = data->chip_info->read_press(data, val, val2); |
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break; |
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case IIO_TEMP: |
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ret = data->chip_info->read_temp(data, val); |
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break; |
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default: |
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ret = -EINVAL; |
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break; |
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} |
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break; |
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case IIO_CHAN_INFO_OVERSAMPLING_RATIO: |
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switch (chan->type) { |
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case IIO_HUMIDITYRELATIVE: |
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*val = 1 << data->oversampling_humid; |
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ret = IIO_VAL_INT; |
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break; |
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case IIO_PRESSURE: |
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*val = 1 << data->oversampling_press; |
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ret = IIO_VAL_INT; |
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break; |
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case IIO_TEMP: |
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*val = 1 << data->oversampling_temp; |
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ret = IIO_VAL_INT; |
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break; |
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default: |
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ret = -EINVAL; |
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break; |
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} |
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break; |
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default: |
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ret = -EINVAL; |
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break; |
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} |
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|
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mutex_unlock(&data->lock); |
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pm_runtime_mark_last_busy(data->dev); |
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pm_runtime_put_autosuspend(data->dev); |
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|
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return ret; |
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} |
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|
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static int bmp280_write_oversampling_ratio_humid(struct bmp280_data *data, |
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int val) |
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{ |
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int i; |
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const int *avail = data->chip_info->oversampling_humid_avail; |
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const int n = data->chip_info->num_oversampling_humid_avail; |
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|
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for (i = 0; i < n; i++) { |
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if (avail[i] == val) { |
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data->oversampling_humid = ilog2(val); |
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|
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return data->chip_info->chip_config(data); |
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} |
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} |
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return -EINVAL; |
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} |
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|
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static int bmp280_write_oversampling_ratio_temp(struct bmp280_data *data, |
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int val) |
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{ |
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int i; |
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const int *avail = data->chip_info->oversampling_temp_avail; |
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const int n = data->chip_info->num_oversampling_temp_avail; |
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|
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for (i = 0; i < n; i++) { |
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if (avail[i] == val) { |
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data->oversampling_temp = ilog2(val); |
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|
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return data->chip_info->chip_config(data); |
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} |
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} |
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return -EINVAL; |
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} |
|
|
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static int bmp280_write_oversampling_ratio_press(struct bmp280_data *data, |
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int val) |
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{ |
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int i; |
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const int *avail = data->chip_info->oversampling_press_avail; |
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const int n = data->chip_info->num_oversampling_press_avail; |
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|
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for (i = 0; i < n; i++) { |
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if (avail[i] == val) { |
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data->oversampling_press = ilog2(val); |
|
|
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return data->chip_info->chip_config(data); |
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} |
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} |
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return -EINVAL; |
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} |
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|
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static int bmp280_write_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, |
|
int val, int val2, long mask) |
|
{ |
|
int ret = 0; |
|
struct bmp280_data *data = iio_priv(indio_dev); |
|
|
|
switch (mask) { |
|
case IIO_CHAN_INFO_OVERSAMPLING_RATIO: |
|
pm_runtime_get_sync(data->dev); |
|
mutex_lock(&data->lock); |
|
switch (chan->type) { |
|
case IIO_HUMIDITYRELATIVE: |
|
ret = bmp280_write_oversampling_ratio_humid(data, val); |
|
break; |
|
case IIO_PRESSURE: |
|
ret = bmp280_write_oversampling_ratio_press(data, val); |
|
break; |
|
case IIO_TEMP: |
|
ret = bmp280_write_oversampling_ratio_temp(data, val); |
|
break; |
|
default: |
|
ret = -EINVAL; |
|
break; |
|
} |
|
mutex_unlock(&data->lock); |
|
pm_runtime_mark_last_busy(data->dev); |
|
pm_runtime_put_autosuspend(data->dev); |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static int bmp280_read_avail(struct iio_dev *indio_dev, |
|
struct iio_chan_spec const *chan, |
|
const int **vals, int *type, int *length, |
|
long mask) |
|
{ |
|
struct bmp280_data *data = iio_priv(indio_dev); |
|
|
|
switch (mask) { |
|
case IIO_CHAN_INFO_OVERSAMPLING_RATIO: |
|
switch (chan->type) { |
|
case IIO_PRESSURE: |
|
*vals = data->chip_info->oversampling_press_avail; |
|
*length = data->chip_info->num_oversampling_press_avail; |
|
break; |
|
case IIO_TEMP: |
|
*vals = data->chip_info->oversampling_temp_avail; |
|
*length = data->chip_info->num_oversampling_temp_avail; |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
*type = IIO_VAL_INT; |
|
return IIO_AVAIL_LIST; |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static const struct iio_info bmp280_info = { |
|
.read_raw = &bmp280_read_raw, |
|
.read_avail = &bmp280_read_avail, |
|
.write_raw = &bmp280_write_raw, |
|
}; |
|
|
|
static int bmp280_chip_config(struct bmp280_data *data) |
|
{ |
|
int ret; |
|
u8 osrs = BMP280_OSRS_TEMP_X(data->oversampling_temp + 1) | |
|
BMP280_OSRS_PRESS_X(data->oversampling_press + 1); |
|
|
|
ret = regmap_write_bits(data->regmap, BMP280_REG_CTRL_MEAS, |
|
BMP280_OSRS_TEMP_MASK | |
|
BMP280_OSRS_PRESS_MASK | |
|
BMP280_MODE_MASK, |
|
osrs | BMP280_MODE_NORMAL); |
|
if (ret < 0) { |
|
dev_err(data->dev, |
|
"failed to write ctrl_meas register\n"); |
|
return ret; |
|
} |
|
|
|
ret = regmap_update_bits(data->regmap, BMP280_REG_CONFIG, |
|
BMP280_FILTER_MASK, |
|
BMP280_FILTER_4X); |
|
if (ret < 0) { |
|
dev_err(data->dev, |
|
"failed to write config register\n"); |
|
return ret; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static const int bmp280_oversampling_avail[] = { 1, 2, 4, 8, 16 }; |
|
|
|
static const struct bmp280_chip_info bmp280_chip_info = { |
|
.oversampling_temp_avail = bmp280_oversampling_avail, |
|
.num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail), |
|
|
|
.oversampling_press_avail = bmp280_oversampling_avail, |
|
.num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail), |
|
|
|
.chip_config = bmp280_chip_config, |
|
.read_temp = bmp280_read_temp, |
|
.read_press = bmp280_read_press, |
|
}; |
|
|
|
static int bme280_chip_config(struct bmp280_data *data) |
|
{ |
|
int ret; |
|
u8 osrs = BMP280_OSRS_HUMIDITIY_X(data->oversampling_humid + 1); |
|
|
|
/* |
|
* Oversampling of humidity must be set before oversampling of |
|
* temperature/pressure is set to become effective. |
|
*/ |
|
ret = regmap_update_bits(data->regmap, BMP280_REG_CTRL_HUMIDITY, |
|
BMP280_OSRS_HUMIDITY_MASK, osrs); |
|
|
|
if (ret < 0) |
|
return ret; |
|
|
|
return bmp280_chip_config(data); |
|
} |
|
|
|
static const struct bmp280_chip_info bme280_chip_info = { |
|
.oversampling_temp_avail = bmp280_oversampling_avail, |
|
.num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail), |
|
|
|
.oversampling_press_avail = bmp280_oversampling_avail, |
|
.num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail), |
|
|
|
.oversampling_humid_avail = bmp280_oversampling_avail, |
|
.num_oversampling_humid_avail = ARRAY_SIZE(bmp280_oversampling_avail), |
|
|
|
.chip_config = bme280_chip_config, |
|
.read_temp = bmp280_read_temp, |
|
.read_press = bmp280_read_press, |
|
.read_humid = bmp280_read_humid, |
|
}; |
|
|
|
static int bmp180_measure(struct bmp280_data *data, u8 ctrl_meas) |
|
{ |
|
int ret; |
|
const int conversion_time_max[] = { 4500, 7500, 13500, 25500 }; |
|
unsigned int delay_us; |
|
unsigned int ctrl; |
|
|
|
if (data->use_eoc) |
|
reinit_completion(&data->done); |
|
|
|
ret = regmap_write(data->regmap, BMP280_REG_CTRL_MEAS, ctrl_meas); |
|
if (ret) |
|
return ret; |
|
|
|
if (data->use_eoc) { |
|
/* |
|
* If we have a completion interrupt, use it, wait up to |
|
* 100ms. The longest conversion time listed is 76.5 ms for |
|
* advanced resolution mode. |
|
*/ |
|
ret = wait_for_completion_timeout(&data->done, |
|
1 + msecs_to_jiffies(100)); |
|
if (!ret) |
|
dev_err(data->dev, "timeout waiting for completion\n"); |
|
} else { |
|
if (ctrl_meas == BMP180_MEAS_TEMP) |
|
delay_us = 4500; |
|
else |
|
delay_us = |
|
conversion_time_max[data->oversampling_press]; |
|
|
|
usleep_range(delay_us, delay_us + 1000); |
|
} |
|
|
|
ret = regmap_read(data->regmap, BMP280_REG_CTRL_MEAS, &ctrl); |
|
if (ret) |
|
return ret; |
|
|
|
/* The value of this bit reset to "0" after conversion is complete */ |
|
if (ctrl & BMP180_MEAS_SCO) |
|
return -EIO; |
|
|
|
return 0; |
|
} |
|
|
|
static int bmp180_read_adc_temp(struct bmp280_data *data, int *val) |
|
{ |
|
__be16 tmp; |
|
int ret; |
|
|
|
ret = bmp180_measure(data, BMP180_MEAS_TEMP); |
|
if (ret) |
|
return ret; |
|
|
|
ret = regmap_bulk_read(data->regmap, BMP180_REG_OUT_MSB, &tmp, 2); |
|
if (ret) |
|
return ret; |
|
|
|
*val = be16_to_cpu(tmp); |
|
|
|
return 0; |
|
} |
|
|
|
static int bmp180_read_calib(struct bmp280_data *data, |
|
struct bmp180_calib *calib) |
|
{ |
|
int ret; |
|
int i; |
|
__be16 buf[BMP180_REG_CALIB_COUNT / 2]; |
|
|
|
ret = regmap_bulk_read(data->regmap, BMP180_REG_CALIB_START, buf, |
|
sizeof(buf)); |
|
|
|
if (ret < 0) |
|
return ret; |
|
|
|
/* None of the words has the value 0 or 0xFFFF */ |
|
for (i = 0; i < ARRAY_SIZE(buf); i++) { |
|
if (buf[i] == cpu_to_be16(0) || buf[i] == cpu_to_be16(0xffff)) |
|
return -EIO; |
|
} |
|
|
|
/* Toss the calibration data into the entropy pool */ |
|
add_device_randomness(buf, sizeof(buf)); |
|
|
|
calib->AC1 = be16_to_cpu(buf[AC1]); |
|
calib->AC2 = be16_to_cpu(buf[AC2]); |
|
calib->AC3 = be16_to_cpu(buf[AC3]); |
|
calib->AC4 = be16_to_cpu(buf[AC4]); |
|
calib->AC5 = be16_to_cpu(buf[AC5]); |
|
calib->AC6 = be16_to_cpu(buf[AC6]); |
|
calib->B1 = be16_to_cpu(buf[B1]); |
|
calib->B2 = be16_to_cpu(buf[B2]); |
|
calib->MB = be16_to_cpu(buf[MB]); |
|
calib->MC = be16_to_cpu(buf[MC]); |
|
calib->MD = be16_to_cpu(buf[MD]); |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* Returns temperature in DegC, resolution is 0.1 DegC. |
|
* t_fine carries fine temperature as global value. |
|
* |
|
* Taken from datasheet, Section 3.5, "Calculating pressure and temperature". |
|
*/ |
|
static s32 bmp180_compensate_temp(struct bmp280_data *data, s32 adc_temp) |
|
{ |
|
s32 x1, x2; |
|
struct bmp180_calib *calib = &data->calib.bmp180; |
|
|
|
x1 = ((adc_temp - calib->AC6) * calib->AC5) >> 15; |
|
x2 = (calib->MC << 11) / (x1 + calib->MD); |
|
data->t_fine = x1 + x2; |
|
|
|
return (data->t_fine + 8) >> 4; |
|
} |
|
|
|
static int bmp180_read_temp(struct bmp280_data *data, int *val) |
|
{ |
|
int ret; |
|
s32 adc_temp, comp_temp; |
|
|
|
ret = bmp180_read_adc_temp(data, &adc_temp); |
|
if (ret) |
|
return ret; |
|
|
|
comp_temp = bmp180_compensate_temp(data, adc_temp); |
|
|
|
/* |
|
* val might be NULL if we're called by the read_press routine, |
|
* who only cares about the carry over t_fine value. |
|
*/ |
|
if (val) { |
|
*val = comp_temp * 100; |
|
return IIO_VAL_INT; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int bmp180_read_adc_press(struct bmp280_data *data, int *val) |
|
{ |
|
int ret; |
|
__be32 tmp = 0; |
|
u8 oss = data->oversampling_press; |
|
|
|
ret = bmp180_measure(data, BMP180_MEAS_PRESS_X(oss)); |
|
if (ret) |
|
return ret; |
|
|
|
ret = regmap_bulk_read(data->regmap, BMP180_REG_OUT_MSB, &tmp, 3); |
|
if (ret) |
|
return ret; |
|
|
|
*val = (be32_to_cpu(tmp) >> 8) >> (8 - oss); |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* Returns pressure in Pa, resolution is 1 Pa. |
|
* |
|
* Taken from datasheet, Section 3.5, "Calculating pressure and temperature". |
|
*/ |
|
static u32 bmp180_compensate_press(struct bmp280_data *data, s32 adc_press) |
|
{ |
|
s32 x1, x2, x3, p; |
|
s32 b3, b6; |
|
u32 b4, b7; |
|
s32 oss = data->oversampling_press; |
|
struct bmp180_calib *calib = &data->calib.bmp180; |
|
|
|
b6 = data->t_fine - 4000; |
|
x1 = (calib->B2 * (b6 * b6 >> 12)) >> 11; |
|
x2 = calib->AC2 * b6 >> 11; |
|
x3 = x1 + x2; |
|
b3 = ((((s32)calib->AC1 * 4 + x3) << oss) + 2) / 4; |
|
x1 = calib->AC3 * b6 >> 13; |
|
x2 = (calib->B1 * ((b6 * b6) >> 12)) >> 16; |
|
x3 = (x1 + x2 + 2) >> 2; |
|
b4 = calib->AC4 * (u32)(x3 + 32768) >> 15; |
|
b7 = ((u32)adc_press - b3) * (50000 >> oss); |
|
if (b7 < 0x80000000) |
|
p = (b7 * 2) / b4; |
|
else |
|
p = (b7 / b4) * 2; |
|
|
|
x1 = (p >> 8) * (p >> 8); |
|
x1 = (x1 * 3038) >> 16; |
|
x2 = (-7357 * p) >> 16; |
|
|
|
return p + ((x1 + x2 + 3791) >> 4); |
|
} |
|
|
|
static int bmp180_read_press(struct bmp280_data *data, |
|
int *val, int *val2) |
|
{ |
|
int ret; |
|
s32 adc_press; |
|
u32 comp_press; |
|
|
|
/* Read and compensate temperature so we get a reading of t_fine. */ |
|
ret = bmp180_read_temp(data, NULL); |
|
if (ret) |
|
return ret; |
|
|
|
ret = bmp180_read_adc_press(data, &adc_press); |
|
if (ret) |
|
return ret; |
|
|
|
comp_press = bmp180_compensate_press(data, adc_press); |
|
|
|
*val = comp_press; |
|
*val2 = 1000; |
|
|
|
return IIO_VAL_FRACTIONAL; |
|
} |
|
|
|
static int bmp180_chip_config(struct bmp280_data *data) |
|
{ |
|
return 0; |
|
} |
|
|
|
static const int bmp180_oversampling_temp_avail[] = { 1 }; |
|
static const int bmp180_oversampling_press_avail[] = { 1, 2, 4, 8 }; |
|
|
|
static const struct bmp280_chip_info bmp180_chip_info = { |
|
.oversampling_temp_avail = bmp180_oversampling_temp_avail, |
|
.num_oversampling_temp_avail = |
|
ARRAY_SIZE(bmp180_oversampling_temp_avail), |
|
|
|
.oversampling_press_avail = bmp180_oversampling_press_avail, |
|
.num_oversampling_press_avail = |
|
ARRAY_SIZE(bmp180_oversampling_press_avail), |
|
|
|
.chip_config = bmp180_chip_config, |
|
.read_temp = bmp180_read_temp, |
|
.read_press = bmp180_read_press, |
|
}; |
|
|
|
static irqreturn_t bmp085_eoc_irq(int irq, void *d) |
|
{ |
|
struct bmp280_data *data = d; |
|
|
|
complete(&data->done); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
static int bmp085_fetch_eoc_irq(struct device *dev, |
|
const char *name, |
|
int irq, |
|
struct bmp280_data *data) |
|
{ |
|
unsigned long irq_trig; |
|
int ret; |
|
|
|
irq_trig = irqd_get_trigger_type(irq_get_irq_data(irq)); |
|
if (irq_trig != IRQF_TRIGGER_RISING) { |
|
dev_err(dev, "non-rising trigger given for EOC interrupt, trying to enforce it\n"); |
|
irq_trig = IRQF_TRIGGER_RISING; |
|
} |
|
|
|
init_completion(&data->done); |
|
|
|
ret = devm_request_threaded_irq(dev, |
|
irq, |
|
bmp085_eoc_irq, |
|
NULL, |
|
irq_trig, |
|
name, |
|
data); |
|
if (ret) { |
|
/* Bail out without IRQ but keep the driver in place */ |
|
dev_err(dev, "unable to request DRDY IRQ\n"); |
|
return 0; |
|
} |
|
|
|
data->use_eoc = true; |
|
return 0; |
|
} |
|
|
|
static void bmp280_pm_disable(void *data) |
|
{ |
|
struct device *dev = data; |
|
|
|
pm_runtime_get_sync(dev); |
|
pm_runtime_put_noidle(dev); |
|
pm_runtime_disable(dev); |
|
} |
|
|
|
static void bmp280_regulators_disable(void *data) |
|
{ |
|
struct regulator_bulk_data *supplies = data; |
|
|
|
regulator_bulk_disable(BMP280_NUM_SUPPLIES, supplies); |
|
} |
|
|
|
int bmp280_common_probe(struct device *dev, |
|
struct regmap *regmap, |
|
unsigned int chip, |
|
const char *name, |
|
int irq) |
|
{ |
|
int ret; |
|
struct iio_dev *indio_dev; |
|
struct bmp280_data *data; |
|
unsigned int chip_id; |
|
struct gpio_desc *gpiod; |
|
|
|
indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); |
|
if (!indio_dev) |
|
return -ENOMEM; |
|
|
|
data = iio_priv(indio_dev); |
|
mutex_init(&data->lock); |
|
data->dev = dev; |
|
|
|
indio_dev->name = name; |
|
indio_dev->channels = bmp280_channels; |
|
indio_dev->info = &bmp280_info; |
|
indio_dev->modes = INDIO_DIRECT_MODE; |
|
|
|
switch (chip) { |
|
case BMP180_CHIP_ID: |
|
indio_dev->num_channels = 2; |
|
data->chip_info = &bmp180_chip_info; |
|
data->oversampling_press = ilog2(8); |
|
data->oversampling_temp = ilog2(1); |
|
data->start_up_time = 10000; |
|
break; |
|
case BMP280_CHIP_ID: |
|
indio_dev->num_channels = 2; |
|
data->chip_info = &bmp280_chip_info; |
|
data->oversampling_press = ilog2(16); |
|
data->oversampling_temp = ilog2(2); |
|
data->start_up_time = 2000; |
|
break; |
|
case BME280_CHIP_ID: |
|
indio_dev->num_channels = 3; |
|
data->chip_info = &bme280_chip_info; |
|
data->oversampling_press = ilog2(16); |
|
data->oversampling_humid = ilog2(16); |
|
data->oversampling_temp = ilog2(2); |
|
data->start_up_time = 2000; |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
|
|
/* Bring up regulators */ |
|
regulator_bulk_set_supply_names(data->supplies, |
|
bmp280_supply_names, |
|
BMP280_NUM_SUPPLIES); |
|
|
|
ret = devm_regulator_bulk_get(dev, |
|
BMP280_NUM_SUPPLIES, data->supplies); |
|
if (ret) { |
|
dev_err(dev, "failed to get regulators\n"); |
|
return ret; |
|
} |
|
|
|
ret = regulator_bulk_enable(BMP280_NUM_SUPPLIES, data->supplies); |
|
if (ret) { |
|
dev_err(dev, "failed to enable regulators\n"); |
|
return ret; |
|
} |
|
|
|
ret = devm_add_action_or_reset(dev, bmp280_regulators_disable, |
|
data->supplies); |
|
if (ret) |
|
return ret; |
|
|
|
/* Wait to make sure we started up properly */ |
|
usleep_range(data->start_up_time, data->start_up_time + 100); |
|
|
|
/* Bring chip out of reset if there is an assigned GPIO line */ |
|
gpiod = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); |
|
/* Deassert the signal */ |
|
if (gpiod) { |
|
dev_info(dev, "release reset\n"); |
|
gpiod_set_value(gpiod, 0); |
|
} |
|
|
|
data->regmap = regmap; |
|
ret = regmap_read(regmap, BMP280_REG_ID, &chip_id); |
|
if (ret < 0) |
|
return ret; |
|
if (chip_id != chip) { |
|
dev_err(dev, "bad chip id: expected %x got %x\n", |
|
chip, chip_id); |
|
return -EINVAL; |
|
} |
|
|
|
ret = data->chip_info->chip_config(data); |
|
if (ret < 0) |
|
return ret; |
|
|
|
dev_set_drvdata(dev, indio_dev); |
|
|
|
/* |
|
* Some chips have calibration parameters "programmed into the devices' |
|
* non-volatile memory during production". Let's read them out at probe |
|
* time once. They will not change. |
|
*/ |
|
if (chip_id == BMP180_CHIP_ID) { |
|
ret = bmp180_read_calib(data, &data->calib.bmp180); |
|
if (ret < 0) { |
|
dev_err(data->dev, |
|
"failed to read calibration coefficients\n"); |
|
return ret; |
|
} |
|
} else if (chip_id == BMP280_CHIP_ID || chip_id == BME280_CHIP_ID) { |
|
ret = bmp280_read_calib(data, &data->calib.bmp280, chip_id); |
|
if (ret < 0) { |
|
dev_err(data->dev, |
|
"failed to read calibration coefficients\n"); |
|
return ret; |
|
} |
|
} |
|
|
|
/* |
|
* Attempt to grab an optional EOC IRQ - only the BMP085 has this |
|
* however as it happens, the BMP085 shares the chip ID of BMP180 |
|
* so we look for an IRQ if we have that. |
|
*/ |
|
if (irq > 0 || (chip_id == BMP180_CHIP_ID)) { |
|
ret = bmp085_fetch_eoc_irq(dev, name, irq, data); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
/* Enable runtime PM */ |
|
pm_runtime_get_noresume(dev); |
|
pm_runtime_set_active(dev); |
|
pm_runtime_enable(dev); |
|
/* |
|
* Set autosuspend to two orders of magnitude larger than the |
|
* start-up time. |
|
*/ |
|
pm_runtime_set_autosuspend_delay(dev, data->start_up_time / 10); |
|
pm_runtime_use_autosuspend(dev); |
|
pm_runtime_put(dev); |
|
|
|
ret = devm_add_action_or_reset(dev, bmp280_pm_disable, dev); |
|
if (ret) |
|
return ret; |
|
|
|
return devm_iio_device_register(dev, indio_dev); |
|
} |
|
EXPORT_SYMBOL(bmp280_common_probe); |
|
|
|
#ifdef CONFIG_PM |
|
static int bmp280_runtime_suspend(struct device *dev) |
|
{ |
|
struct iio_dev *indio_dev = dev_get_drvdata(dev); |
|
struct bmp280_data *data = iio_priv(indio_dev); |
|
|
|
return regulator_bulk_disable(BMP280_NUM_SUPPLIES, data->supplies); |
|
} |
|
|
|
static int bmp280_runtime_resume(struct device *dev) |
|
{ |
|
struct iio_dev *indio_dev = dev_get_drvdata(dev); |
|
struct bmp280_data *data = iio_priv(indio_dev); |
|
int ret; |
|
|
|
ret = regulator_bulk_enable(BMP280_NUM_SUPPLIES, data->supplies); |
|
if (ret) |
|
return ret; |
|
usleep_range(data->start_up_time, data->start_up_time + 100); |
|
return data->chip_info->chip_config(data); |
|
} |
|
#endif /* CONFIG_PM */ |
|
|
|
const struct dev_pm_ops bmp280_dev_pm_ops = { |
|
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, |
|
pm_runtime_force_resume) |
|
SET_RUNTIME_PM_OPS(bmp280_runtime_suspend, |
|
bmp280_runtime_resume, NULL) |
|
}; |
|
EXPORT_SYMBOL(bmp280_dev_pm_ops); |
|
|
|
MODULE_AUTHOR("Vlad Dogaru <[email protected]>"); |
|
MODULE_DESCRIPTION("Driver for Bosch Sensortec BMP180/BMP280 pressure and temperature sensor"); |
|
MODULE_LICENSE("GPL v2");
|
|
|